GdkImage.gdkImageNew(type, visual, width, height)typeGdkImage, one of GDK_IMAGE_NORMAL, GDK_IMAGE_SHARED
and GDK_IMAGE_FASTEST. GDK_IMAGE_FASTEST is probably the best choice, since
it will try creating a GDK_IMAGE_SHARED image first and if that fails it will
then use GDK_IMAGE_NORMAL.visualGdkVisual to use for the image.widthheight